Green’s Dictionary of Slang

bah-fungoo! excl.

[Ital. vatf’anculo, ‘go fuck yourself in the ass’]

1. (US, also aba-fangool! fungoo!) an excl. of contempt or dismissal, e.g. go fuck yourself!

[US](con. 1944) J.H. Burns Gallery (1948) 288: Ah, fungoo and ya signorinas, the patients answered.
[UK](con. 1944) A. Myrer Big War 247: ‘Ah, fungoo and your fresh water showers,’ Ricarno yelled.
[US]E. Torres After Hours 182: Aba-fangool! Did I say that? Don’t talk like a cafone, awright?
F. Exley Last Notes from Home 62: The guy would turn back, smile, wave and say, ‘Yeah, bah-fungoo or whatever!’.
[US](con. 1964–8) J. Ellroy Cold Six Thousand 466: Tran flipped Pete off. The wop stiff-arm — il bah-fungoo.
[US]Mad mag. Feb. 24: Take the bucs and the points, huh? Fungoo!!
[US]D. Winslow The Force [ebook] ‘Bless me, Father, for I have sinned.’ ‘Va fangul’.

2. attrib. use of sense 1.

[US]J. Ellroy Amer. Tabloid 155: Sal gave him the bah-fungoo sign.